Astro 1760 Air Windshield Knife Kit with Suction Cups Windshield Knife: has a teasing throttle and regulator provide easy speed control. 20,000 Oscillations per minute Flexible 12 position blade mount, Includes 5 blades Rear exhaust Includes (4) 4-5/8 inch Diameter suction cups, Capacity 154pounds. Blow Molded storage case